Inclosed arc-lamp.



K. FERBER & W. WISSMANN.

INCLOSED ARC LAMP.

APPLICAHON FILED APR-4.1913.

1,205,725. I Patented Nov. 21, 1916.

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UNTTED STATES PATENT OFFICE.

KARL FERIBER, OF BERLIN, AND WILI-IELM WISSMANN, OF CHARLOTTENBURG, GEE-MANY, ASSIGNORS T0 SIEMENS-SCHUCKERT VJERKE G. M. B. I-L, OF BERLIN,GERMANY, A CORPORATION OF GERMANY.

INCLOSED ARC-LAMP.

Application filed April 4, 1913.

T 0 all whom it may concern.

Be it known that we, KARL FERBER and lVILi-IELM IVIssMANN, citizens ofthe German Empire, and residing, respectively, at Berlin andCharlottenburg, near Berlin, Germany, have invented certain new anduseful Improvements in Inclosed Arc- Lamps, of which the following is aspecification.

Our invention rel-ates to inclosed arclamps comprising smoke arresters.

Inclosed arc-lamps having electrodes which deposit considerablequantities of solid matter are known in which a smoke chamber isprovided for cleansing the gases discharged from the arc, said chamberhaving a baffle whose lower end is curved to be directed toward the arcand so that it will be within a short distance of the economizer. Thearrangement is such that the gases issuing from the economizer chamberare caught by the lip of said baflie, are guided along one side of theguide to the other end of the smoke chamber, here pass around the end ofthe baflie and return along the other side into the globe. Such anarrangement renders unnecessary the employment of an enveloping globeclosely surrounding the arc and economizer.

A primary object of our invention is to provide means for causingimproved circulation of the gases in arc-lamps of this kind. To this endwe arrange transversely of the end of the inwardly-curved portion of thesaid baiiie an additional bathe or deflector which slants out-ward andprojects into the return-pas age for the gases. This baflie or deflectort directs the gases downward and outward and thus prevents them fromreturning directly to the are around the end of the baflie (Z. At thesame time it has the effect of preventing the rising and descendinggases from disturbing each other and forming eddies at the lower end ofthe baffle (Z. These two efiects favor the spreading of the returninggases throughout the entire space of globe g. In this way the gases losetheir velocity and slowly and quietly return to the arc. Finally, as aresult of the improved spreading out of the gases and because of thefact that they follow the lower path, (caused by the deflecting surfacef), the globe is heated more thoroughly and more uniformly. Finally, theadditional Specification of Letters Patent.

Patented Nov. 21, 1916.

Serial No. 758,970.

baffle or deflector provides an excellent means for proportioning theratio of the cross-sections of the outgoing and the return passages.

According to our invention the additional battle or deflector extendssomewhat beyond the issue baiiie not only in the direction of the returnpassage but also in that of the uptake. In this way a trough is formedat the same time, for catching the coarser particles of ash which arepresent in the ascending current of hot gases. Further, according to ourinvention we provide improved packing betweeii the removable portion ofthe lamp and the body. The said removable portion or globe-carrier makestight fit w'th the lamp-body at at least two places located at a certaindistance apart. Particular care is devoted to the tightening nearest tothat chamber of the lamp in which the arc burns, a preferable form beinga male conical extension of the lower portion of the lamp pressed into acorresponding fe male portion of the lamp-body. The second joint ortightening need not be such a good one.

The accompanying drawing, to which we will now refer, illustrates by wayof example in vertical section one embodiment of our invention.

Between the walls a, b is the smoke-chamber A which extends verticallyupward from the edge of the economize-r o. In the smoke-chamber A is thebaffle (Z which is curved inward at its lower end in the direction ofthe arc. On the lowest part of the baffle (Z is mounted the additionalbaille or deflector 2, having the form of a reflecting shade. Thedeflector 25 projects somewhat beyond the inner face of the baflie (Z,so that a channel f is formed, wherein the coarser particles of ash arecaught from the rising stream of hot gases. The path of the gases formedby the arc is indicated in the drawing by arrows.

The chamber of the lamp wherein the arc burns is closed below by the twoglass globes g, g mounted in holders h, 2', respectively, which arefirmly connected together and are pressed by the fasteners 7" into thebody of the lamp. The two packings are obtained at the places 7c, Z andm, n, which surfaces are pressed upon one another by means of thefastening levers r.

7c is a male conical portion which is firmly connected with the holdersor mounts h, i of the globes and which, when the fasteners 1" are beingfastened beds itself firmly into the female conical portion Z of thebody of the lamp. be made of a comparatively small width whereby thespecific mutual pressure one on the other is increased and the jointmade more perfect. The second joint, arranged at a certain distance fromthe first, is formed by the cylindrical portion m of the lamp body intowhich the cylindrical portion a of the holders enters, fitting asperfectly as possible. A still better closure of the lamp-body isobtained when two cylindrical portions 0, 7) are connected to theconical portions 7a, Z, which cylindrical portions also fit one-in theother as perfectly as possible and serve as guides when the lowerportion of the lamp is being hung in its place. The cylindrical portion10 is preferably enlarged below, as shown in the drawing, so that itembraces at m the mounts i, it. Further, it is preferable to arrangebetween the two tightening places 0, Z and m, n a chamber at of amplesize so that a kind of angular joint is formed.

\Ve claim V 1. In an inclosed arc-lamp the combination with a casinghaving an inner clownwardly-projecting portion bounding a smoke chambertherein, an economizer mounted at the end of said portion, and a battlemounted in said chamber and curved at its lower end in the direction ofsaid economizer, said baffle dividing said cham- 'tion with a casinghaving an inner downwardly-projecting portion bounding a smoke chambertherein, an economizer mounted at the end of said portion, and a bafliemounted in said chamber and curved at its lower end in the direction ofsaid economizer, said baffle dividing said cham- The two conicalportions may ber into an uptake passage and a downtake passage havingorifices which are immediately adjacent to each other, of a deflectormounted transversely on the end of the curved portion of said battle andeX' ber and curved at its lower end in the di-- rection of saideconomizer, said bafiie dividing said chamber into an uptake passage anda downtake passage having orifices which are immediately adjacent toeach other, of a deflector mounted transversely on the end of the curvedportion of said baffle and extending into said downtake passage, saidglobe-carrier forming with said casing a plurality of air-tight jointsfor the purpose specified.

4. In an inclosed arc-lamp the combination with a casing having an innerdownwardly-projecting portion bounding a smoke chamber therein, aglobe-carrier mounted in the outer portion of the casing, an economizermounted at the end of said portion, and a baflie mounted in said chamberand curved at the lower end in the direction of said economizer, saidbaffle dividing said chamber into an uptake passage and a downtakepassage having orifices which are immediately adjacent to each other, ofa deflector mounted transversely on the end of the curved portion ofsaid battle and extending into said downtake passage, said globe-carrierforming with said casing a labyrinth packing, for the purpose specified.

In testimony whereof we have signed our names to this specification inthe presence of two witnesses.

KARL FERBER. WILHELM WVISSMANN. IVitnesses HENRY HASPER, WOLDEMAR HAUrT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

